diff --git a/srcpkgs/synapse/patches/revert_frozendict_upperbound.patch b/srcpkgs/synapse/patches/revert_frozendict_upperbound.patch
deleted file mode 100644
index 4a5e068a828..00000000000
--- a/srcpkgs/synapse/patches/revert_frozendict_upperbound.patch
+++ /dev/null
@@ -1,13 +0,0 @@
---- b/pyproject.toml
-+++ a/pyproject.toml
-@@ -154,9 +154,7 @@
- # we use the TYPE_CHECKER.redefine method added in jsonschema 3.0.0
- jsonschema = ">=3.0.0"
- # frozendict 2.1.2 is broken on Debian 10: https://github.com/Marco-Sulla/python-frozendict/issues/41
-+frozendict = ">=1,!=2.1.2"
--# We cannot test our wheels against the 2.3.5 release in CI. Putting in an upper bound for this
--# because frozendict has been more trouble than it's worth; we would like to move to immutabledict.
--frozendict = ">=1,!=2.1.2,<2.3.5"
- # We require 2.1.0 or higher for type hints. Previous guard was >= 1.1.0
- unpaddedbase64 = ">=2.1.0"
- # We require 1.5.0 to work around an issue when running against the C implementation of
diff --git a/srcpkgs/synapse/template b/srcpkgs/synapse/template
index 9fd2a9018d9..7c053869664 100644
--- a/srcpkgs/synapse/template
+++ b/srcpkgs/synapse/template
@@ -1,13 +1,13 @@
 # Template file for 'synapse'
 pkgname=synapse
-version=1.80.0
+version=1.81.0
 revision=1
 build_style=python3-pep517
 build_helper=rust
 make_check_target=tests
 make_install_target="dist/matrix_synapse-${version}-*-*-*.whl"
 hostmakedepends="python3-poetry-core python3-setuptools-rust cargo"
-depends="python3-jsonschema python3-frozendict python3-unpaddedbase64
+depends="python3-jsonschema python3-immutabledict python3-unpaddedbase64
  python3-canonicaljson python3-signedjson python3-pynacl
  python3-service_identity python3-Twisted python3-openssl python3-yaml
  python3-pyasn1 python3-pyasn1-modules python3-bcrypt python3-Pillow
@@ -24,7 +24,7 @@ license="Apache-2.0"
 homepage="https://github.com/matrix-org/synapse"
 changelog="https://raw.githubusercontent.com/matrix-org/synapse/develop/CHANGES.md"
 distfiles="https://github.com/matrix-org/synapse/archive/v${version}.tar.gz"
-checksum=7835d4790fb340269595fd792a6f7d6e49b004698634eca3c2453b8adc21b9f9
+checksum=2d9753961772d385464b9c6ebfc20fc42adc27e883689014994c1c42cbdf1456
 
 if [ "$CROSS_BUILD" ]; then
 	makedepends+=" rust-std"